Fish Tank Heater with LED Digital Display Thermostat, Submersible Aquarium Heater with Protective Housing, 300W Adjustable Fish Heater for 40-75 Gallon Tanks

I bought two of 300w heaters for my 125 gallon aquarium. I set both at 82, The tank was 78 when I put them in. Within a short time the tank was at 82.1 and both shut off. One heater read 82 and one read 81.9. They seem accurate. They blend into the black background perfectly and there are no lights on them inside the tank. The controls are easy to work. The display is bright and easy to read.I had it run for 24 hours, one heater was at 82.1, the second was at 81.5 and my thermometer was at 81.8. These numbers are all close enough. I won't go back to dial turn heaters, they are hard to adjust and keep adjusted. Digital is the way to go.

Worked well right out of the box. Easy to setup and use. Nice display.

This little heater is so small and cute, and it's exactly what I needed for my !5 gallon, nano cube, aquarium. I had been running it without a heater for the past several months, but now that the colder season is rapidly rolling in, I knew I would need to invest in something to keep my fish (plants and snails) comfortable and thriving; they are after all, tropical fish.✅ SIZE: this thing is no longer than my entire hand, and no thicker than my thumb. it's so compact and slim, that i was able to fully conceal it behind some wood decorations and plants. it's perfectly ideal for those that don't like seeing any equipment inside of their tank and in the water.✅ WORKS FAST: before plugging the heater in, my tank water temp read at roughly 70° F. that's definitely too low for tropical fish. after plugging it in. i waited roughly fifteen or twenty minutes and took another temp reading, and it was now, 79.6° F! that's amazing! it has held at that temperature with .1 or so fluctuations ever since i installed it, a couple of weeks ago. so, it gets to working the very second you plug it in, and of course depending on the water flow and current of your tank, it will heat really quickly! i love that.✅ EASY TO OPERATE: the external operating box is all in line with the power cord, so you don't have to worry about having extra cords getting messy and tangled. the operation box is very basic with a button and a clear, bright digital read out of the temperature. it's very easy to set and adjust, as ive not experienced any issues thus far.❌ CORD LENGTH: so, ive noticed this has been a major issue with several of the newer heaters on the market lately. especially those that include the operating/controller box, all in line with the power cord for the heater. the control box is a good distance from the heater, as it's not supposed come in contact with water. however the distance from the control box to the actual outlet plug, is where there has been major manufacturing flaws. since most everyone likes to conceal power cords and wires, we also tend to hide outlets, and power strips that run all the aquarium equipment. if the co trolls box is too close to the plug, we are them unable to see or reach the control box. so there really needs to be more length between the co trolls box and the actual plug. unless your outlets are installed in the middle of your wall, or the power strip is exposed, visible, out in the open.✴ OVERALL RATING: ⭐⭐⭐⭐ FOUR STARS! ———————————————————♡》》》 IN SUMMARY: despite the issue about the cord lengths, which seems to be a consistent and on-going issue with many, many, many, heaters that are currently on the market, this little heater is almost perfect! it's very small, compact, easy to conceal inside the tank, it works very quickly and efficiently, and stays consistent with keeping the temperature stable. aside from the cord length issue, i like it even more that there was NO WRITING OR PRINT ON THE HEATER itself, as doesn't make the heater stand out, or attempting to draw attention to it, when that's how things are supposed to be, for an aquarium — the inhabitants and natural decorations should always be the focal point in an aquarium. so, the the less distracting and noticeable the heater and internal equipment is, the better. it's almost the perfect nano heater. ♡

Perfect size for my 16 gallon tank and like the led read out on it.

This works great. Easy to set and it handles the rest. I have it in a 75 gallon saltwater aquarium and it works great. My only complaint is that the suction cups could be a little stronger, it has come loose a few times.

Received the 200w heater and it was perfectly packaged. Let it get to room temp before installation. Unit had perfect and heavy duty suction cups and a nice long cord. My 55 gal tank was at 64 degrees as my other heter stopped a few days ago without knowing so the temp dropped. I put this heqter in, plugged it in and set the temp to 74. Checked the tank an hour later and the temp was at 74. It works great so far. Thinking of replacing the heater in my 75 gal tank in the near future. Will definately buy the same product in a 300w.

I like the all black look, which hides nicely in my tank. Used for two weeks and it keeps temp regular, the setup is easy.I recommend.

Great product works better than any other one i have purchased. And very easy to use